Chevrolet TrailBlazer 2007 Owner's Manual page 78

Frontal airbags (driver and right front passenger)
are not intended to inflate during vehicle
rollovers, rear impacts, or in many side impacts.
Your vehicle has seat position sensors which
enables the sensing system to monitor the position
of the driver's seat and the right front passenger's
seat. Seat position sensors provide information
that is used to determine if the airbags should
deploy at a reduced level or at full deployment.
Your vehicle may or may not have roof-mounted
airbags and a rollover sensor. See Airbag
System on page 71. These "rollover capable"
airbags are intended to inflate in moderate
to severe side crashes or during a rollover. A
roof-mounted airbag will inflate if the crash severity
is above the system's designed "threshold
level." The threshold level can vary with specific
vehicle design. Roof-mounted airbags are not
intended to inflate in frontal or near-frontal impacts,
or rear impacts. Both roof-mounted airbags will
deploy when either side of the vehicle is struck or
during a rollover.
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In any particular crash, no one can say whether
an airbag should have inflated simply because
of the damage to a vehicle or because of what the
repair costs were. For frontal airbags, inflation is
determined by what the vehicle hits, the angle
of the impact, and how quickly the vehicle slows
down. For roof-mounted airbags, inflation is
determined by the location and severity of
the impact.
The airbag system is designed to work properly
under a wide range of conditions, including off-road
usage. Observe safe driving speeds, especially
on rough terrain. As always, wear your safety belt.
See Off-Road Driving (Except SS) on page 317
for tips on off-road driving.